Ahmed

Adds cl_khr_kernel_clock test. Also fixes failure in the compiler defines for extension compiler subtest when cl_khr_kernel_clock is supported.

Hi, Should we limit the cl_ext_image_from_buffer tests to only the core formats of the specification? In the same way the other image kernel_read_write do with `filter_formats`? For format like YUV...

Basic explicit_s2v: The verification step was always using round to even when converting a float to half even for round to zero cores. Commonfns degrees: The verification step was only...